Stack Opacity Meter: 

http://www.vasthi.com/stack-opacity-meter

Opacity Monitoring System has been designed for measuring the pollutants with in the Stack Emission.
Vasthi has mainly designed the Stack Opacity Meter for Cement Plants, Steel Plants etc.,

Technical Specifications:
No. Parameter Units Min Max Comment
1 Path Length (flange to flange) m 0.5 20 Flange-to-flange separation
2 Measuring Range % 0.0 100.0 User selectable
3 Accuracy % -2 +2
4 Resolution % 0.1 Display resolution
5 Damping s 1 60 Selectable
6 Drift with Temperature % -2 +2 Over any 20°C in the operating range
7 Operating Wavelength nm 510 540 Green LED
Power & Air Requirements
8 Voltage Vdc +24 Optional 90-260Vac PSU available
9 Voltage Tolerance % -10 +10
10 Nominal Current Consumption mA 400
11 Power Up Current Consumption mA 400
12 Air Supply Volume Flow L/min 50 200 To each air-purge body.
13 Air Supply Fitting:1” BSP threaded aperture in each air-purge body Cable and Wire
14 Cable type – TX/RX Interconnection cores 6 Screened multi-core, such as Belden 9873
15 Cable type – OI/RX Interconnection cores 4 Screened multi-core, such as Belden 9873
16 Wire Size at Terminal Connections AWG 20 14 Interface Options
17 Serial CommsModBus RTU via RS485 (OI or TRX) Internal USB (OI), external USB (RX)
18 Analogue Output (one) mA 4 20 Isolated and scalable
19 Digital Relay Contacts (two) A 0 3 @30Vdc (signal level and data valid)
Physical
20 Ingress Protection: – TX/RX Heads IP65 For external use
21 Ingress Protection: – OI Wall Mounted IP65 Hinged door and terminal compartment shut.
– OI Panel Mounted IP64 From front face of panel when installed.
22 Ambient Operating Temperature °C -20 +55 Air temperature around the heads.
23 Operating Humidity % 100 Air humidity around the heads.
24 Gas Temperature °C +600 Heat insulating gaskets included.
(Higher temperatures on request)
25 Regulatory Compliance 89/336/EEC (Electromagnetic Radiation) 73/23/EEC (Low Voltage)
26 Materials: – TX/RX Heads 316 Stainless Steel (powder coated)
27 Materials: – Air-Purge Bodies Powder coated cast aluminium or stainless steel for demanding installations Materials: – OI Wall Mounted UL rated polycarbonate enclosure; aluminium front panel with PU laminate overlay and with nylon cable glands
28 – OI Panel Mounted Powder coated steel back-box; aluminium front panel with PU laminate overlay and with nylon cable glands
29 Weight kg 2.5 TX or RX head plus Aluminium Air-Purge body
30 Weight: – OI Wall Mounted kg 1.3 – OI Panel Mounted 1.3